A Near-Field Electromagnetic Scattering Simulation Method for Superelectric Large-Scale Targets

A technology of large size and simulation method, applied in design optimization/simulation, 3D modeling, instruments, etc., can solve problems such as difficult to meet, achieve time-saving, high-precision fast electromagnetic scattering simulation, and reduce complexity.

Active Publication Date: 2021-08-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Radar far-field conditions (r>2D 2 / λ, where r represents the distance from the target to the radar, D represents the target size, and λ represents the wavelength of the radar wave) is usually difficult to satisfy

Method used

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  • A Near-Field Electromagnetic Scattering Simulation Method for Superelectric Large-Scale Targets
  • A Near-Field Electromagnetic Scattering Simulation Method for Superelectric Large-Scale Targets
  • A Near-Field Electromagnetic Scattering Simulation Method for Superelectric Large-Scale Targets

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Experimental program
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Embodiment 1

[0047] This embodiment provides a near-field electromagnetic scattering simulation method for ultra-electric large-scale targets, and the specific steps are as follows:

[0048] Step 1: Use the 3D modeling method based on triangular surface element mesh to model, and export it as a model in the general STL (StereoLithography) format for future use.

[0049] Step 2, import the above-mentioned model file in STL format into a graphics processing unit (Graphics Processing Unit, GPU) for calculation, and read the coordinate information and surface normal information of each triangular surface element constituting the radar target.

[0050] Step 3, input the parameters to be calculated; the parameters to be calculated include radar system type, radar wave frequency f, incident angle θ, azimuth angle The distance R between the transmitting radar and the center of the target T , the distance R between the receiving radar and the center of the target R , as well as the number of Mon...

Embodiment 2

[0077] The simulation method provided by embodiment 1 is tested: as Figure 4 A cargo ship model is provided with a bounding box of 135m in length, 16m in width and 25m in height, and the following simulation tests are carried out on it: a monostatic radar with a working mode of 300MHz, the incident angle ranges from 45° to 90°, and the azimuth angle ranges from 0 to 360°, the distance from the radar to the target center is r=1km (the simulation result is marked as RCS-1km) and r=10km (the simulation result is marked as RCS-10km).

[0078] Comparison case: the distances from the radar to the target center are r=1km and r=10km respectively, and the conventional far-field scattering simulation test is adopted, and the far-field simulation scattering results are marked as RCS-ff.

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Abstract

The invention discloses a near-field electromagnetic scattering simulation method for ultra-electric large-scale targets: import a model file in STL format, read the relevant information of each triangular surface element that constitutes a radar target; input parameters that need to be calculated; judge the surface Whether the element is illuminated by the incident wave, and mark the illuminated surface element; for each triangular surface element marked as illuminated, calculate its surface current and magnetic current: solve each triangular surface element marked as illuminated The resulting scattered field will be the scattered field E of all triangular surfels marked as illuminated sn After all are solved, according to the principle of vector superposition, add them all up to get the total scattering field; get the RCS value σ of the radar target in the near field according to the following formula 0 , and output the result: the present invention fills the gap in the field of target near-field RCS simulation algorithm, especially the electromagnetic simulation processing method of different surface elements under near-field scattering conditions, which is more suitable for actual engineering scenarios.

Description

technical field [0001] The invention relates to the technical field of electromagnetic scattering, in particular to a near-field electromagnetic scattering simulation method for superelectric large-scale targets. Background technique [0002] In electromagnetic scattering simulation, people often use radar cross section (RCS) to characterize the electromagnetic scattering capability of a target object. It plays an important role in the analysis of target scattering characteristics and identification of air targets, and it is also an important technology to reflect the stealth performance of targets. Therefore, the simulation of RCS has become a key technology in the analysis of radar target electromagnetic scattering characteristics and radar target recognition. [0003] Radar far-field conditions (r>2D 2 / λ, where r represents the distance from the target to the radar, D represents the target size, and λ represents the wavelength of the radar wave) is usually not easy t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06T17/20
CPCG06T17/20
Inventor 杨伟廖成晋齐聪慧赵志钦胡皓全雷世文田径
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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